GREGORY HAMAN (M.D.) – Internal Medicine Physician, NPI 1033590773
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
8,828 INTERNAL MEDICINE in IL
Provider Addresses for GREGORY HAMAN (M.D.)
Cermak Health Services of Cook County
2800 South California Avenue
Chicago, IL 606085107
Phone: (773) 674-7488
Type: Location
5 FOUNDERS ST STE 100
WILLIMANTIC, CT 062262049
Phone: (860) 423-9764
Type: Location
5841 S Maryland Ave
Room A700; MC-7082
Chicago, IL 606371447
Phone: (773) 702-6840
Type: Location
1290 SILAS DEANE HWY
HHC CVO ENROLLMENT 1ST FLOOR
WETHERSFIELD, CT 06109
Phone:
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2021-02-17
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20200508001093 | I | Internal Medicine | CT | TBD |
| I20210217001220 | I | Internal Medicine | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 407 | 178 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 132 | 132 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 99 | 80 | $0 |
| G0008 | Administration of influenza virus vaccine | 83 | 81 | $0 |
| 90662 | Influenza vaccine split virus, preservative free | 56 | 56 | $0 |
Insurance plans in this area (ZIP 60608)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Physician Assistant | CT | |
| - | CT | |
| - | MA | |
| - | CT | |
| - | CT | |
| - | CT | |
| Nurse Practitioner | CT | |
| - | CT | |
| Internal Medicine | CT | |
| - | CT |
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